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How Acceleration is Determined

All acceleration values are specified and reported in milli-Gs. 1G (gravity) = 1000 milli-Gs, or freefall acceleration (as experienced when a skydiver jumps out of a plane). A high performance car at a race track can rarely get above 900 milli-Gs on any axis, and an acceleration of 1000milli-Gs corresponds to a 0-60mph time of 2.8 seconds, significantly faster than most of our customers expect from their vehicles! A family sedan rarely exceeds 400 milli-Gs on any axis (acceleration, braking, or cornering).


Defaults:


20: kmh: do not record any events where the speed is less than this threshold (prevents lots of spurious events pulling out at junctions). Recommended setting is between 10km/h and 20km/h.


0: seconds minimum between alerts, a backoff timer to prevent multiple events being reported in a single location (e.g. Off/ on ramp at cloverleaf type freeway interchange). This backoff does not apply to LARGE_G events. Note that setting this to a non-zero value can result in the GNX not reporting significant acceleration events so it is not recommended to use a non-zero setting.


200: milli-gs acceleration to trip an ACCEL event (61) 250: milli-gs acceleration to trip a DECEL event (62) 300: milli-gs acceleration to trip a HARSH_TURN event (100)


700: milli-gs acceleration to trip a LARGE_G event (101) (crash detection) (this has been found to be a good value to avoid false detections while capturing most severe events).


50: milli-gs acceleration to trip a TILT event (103)


0: seconds: minimum duration of acceleration event. Set to non-zero value to prevent reporting of events of shorter duration than the specified minimum duration.

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